Stud for explosive installation



Aprll 27, 1954 v. R. 4ERICKSON sTun FQR ExPLosIvE INSTALLATION M26/,ww fg. :exc/(for Filed 001;. 18, .1952

, ma' "n "s -HTTWEX Patented Apr. 27,Y 1954 UNITED stars PATENT GFFICE STUD FOR EXPLOSIVE INSTALLATION Application October 18, 1952, Serial No. 315,598

6 Claims.

The present-l invention relates to stud driving tools of the type employed for installing studs by explosive action in Wall surfaces, such as concrete and steel, and is concerned more particularly with the provision of an improved stud embodying means for maintaining its position in the bore of the barrel of a tool.

In accordance with the instant invention, the stud is provided with a frictional portion or element or improved character to hold the stud in place in the tool, which enables easy entry of the stud into the breech end of the barrel, which is not lost easily from the stud in handling of the studs before use, which is not apt to be blown off during the explosion, and which does not require care in packaging and is adapted to packaging in a box.

The above and other objects of the invention are attained in certain preferred embodiments of the invention as described in connection with the accompanying drawings, in which:

Figure 1 is an elevational view of a stud driving tool employing the invention, with a portion of the tool adjacent the combustion chamber broken away and shown in section to illustrate details of construction.

Figure 2 is a side elevational view of a stud as shown in Figure 1.

Figure 3 is an end elevational view of the stud shown in Figure 2.

Figure 4 is a fragmentary enlarged cross-sectional view of the stud as installed in the bore of the barrel, the View being taken as indicated by the line 4--4 in Figure 1.

Figures 5 and 6 are elevational views of a modifled form of stud.

Figure 7 is a side elevational view of another modified stud.

Referring to Figure 1, there is shown a stud driving tool of the character described and claimed in the co-pending application of Daniel T. Phillips et al., Serial No. 274,172, filed February 29, 1952, for Stud Driving Tool. In general, stud driving tools of this character are adapted to be separated or broken into two halves including a rear half Ill which contains the various fire control parts, including, for example, a ring pin carrier II, and a front or barrel half I2 of the tool in which the barrel I3 is included. The barrel I3 is provided with a threaded rear end Ita which has a threaded connection Within the end of the firing pin carrier II to connect the two halves of the tool. The barrel I3 is also provided with an enlarged bore to receive a removable breech plug I4 in which the explosive cartridge I5 is mounted for impact by the ring pin of the iiring mechanism. With the parts disassembled, the breech plugr lli is removed and the selected stud I1 is installed in the barrel, the cartridge I5 is placed in the breech plug It, and the parts are reassembled as shown in Figure 1 for a ring operation. Firing is accomplished by placing the end of the barrel I3 against the surface into which the stud is to be driven and pressing or telescoping the barrel assembly I2 and the firing pin carrier Il back into the other portions of the tool until a ring position is reached, as disclosed in said application, and then effecting relative turning movement of the central housing and the end grip I8 to re the tool. At this time the deiiector pad structure I9, yieldably mounted about; the barrel I3, is engaged with the surface about the area of engagement of the end of the barrel so as to provide protection from flying particles of the wall surface upon exposive installation of the stud.

Referring in particular to Figures 1, 2, 3 and 4, the stud VI is of special construction and includes a frictional portion or element which is used to frictionally hold or secure the stud in a selected adjusted position in the barrel against movement in either direction. Studs of this general type are disclosed and claimed in the copending application of Webber and Erickson, Serial No. 136,186 filed December 31, 1949, and granted as U. S. Letters Patent No. 2,637,241, on May 5, 1953, for Stud for Explosive Installation. The improved stud shown herein includes the usual sharpened point Ila and the head Ib which is of a diameter to iit closely but freely within the bore of the barrel I3. The stud I'l also includes a shank I Ic intermediate the point and the head which may include a straight, knurled portion I'id. The stud carries the frictional element 2| which is in the form of a plastic sleeve or tube having a circular array of radially extending fins 22. rThe ns 22, as seen in Figures 3 and 4, are of slightly greater diameter than the head I'Ia of the stud and are deformed or flexed laterally when inserted in the bore of the barrel. rIhe frictional retainer 2I, by virtue of the engagement of its fins 22, within the bore of the barrel, aids in maintaining the stud properly centered with respect thereto, and by virtue of this fact enables a reduced length, when desirable, of the head I'ib of the body of the stud. The side Walls of a iin 22 are preferably parallel to facilitate flexing thereof. The retainer portion of the stud also facilitates packing the studs in boxes and tends to maintain a stable position thereof during shipment and handling. The frictional retainer portion of the stud may be constructed of any suitable iiexible, resilient material, such as paper, plastic, rubber, ,or the like, to be readily removable or destructible, but is preferably of a vinyl resin which is readily combustible or friable so that the ring will be destroyed or substantially destroyed by burning during the expelling of the stud from the tool.

In the modification shown in Figures 5 and 6, a stud Il is shown including a frictional retainer element 23 whose radially extending ns 24 have a generally triangular cross-section.

Referring to Figure 7, in this form of the nvention the stud I1 includes a frictional retainer 26 'whose parallel ns 21 which are generally similar to those shown in Figures 2 and 3 but which are twisted or of spiral configuration to provide a riing effect for the stud during its travel along the barrel. This effect increases the stability of the stud after it leaves the barrel of the tool while penetrating the Work surface,

The frictional retainer shown can be made as an extruded plastisol tubing which is cut to the desired length.

While I have shown and described certain preferred embodiments of the invention, it will be apparent that the invention is capable of both modification and variation from the form shown so that the scope thereof would be limited only by the scope of the claims appended hereto.

I claim:

1. A stud for insertion into the surface of a work piece by its ejection through the bore of an explosively operated stud driving tool, said stud comprising a body having a cylindrical head at its rearward end and having a surface penetrating shank at its forward end terminating in a sharpened point, the junction of said head 1 and said shank providing a shoulder, said stud also including a tubular frictional retainer carried on said body and having a circular array of radially extending longitudinal flexible ns extending outwardly beyond the largest diameter of the body.

2. A stud for insertion into the surface of a work piece by its ejection through the bore of an explosively operated stud driving tool as claimed in claim l, in which the side walls of a fin are parallel.

3. A stud for insertion into the surface of a work piece by its ejection through the bore of an explosively operated stud driving tool as claimed in claim 1, in which each 1in is of triangular cross-section.

4. A stud for insertion into the surface of a work piece by its ejection through the bore of an explosively operated stud driving tool as claimed in claim 1, in Which said frictional retainer comprises a tubular plastic structure of uniform cross-sectional shape throughout its length.

5. A stud for insertion into the surface of a work piece by its ejection through the bore of an explosively operated stu-:l driving tool as claimed in claim l, in which each iin is of spiral conguration,

6. A stud for insertion into the surface of a work piece by its ejection through the bore of an explosively operated stud driving tool as claimed in claim 1, in which the side Walls of a n are parallel; and each fin is of spiral configuration.

References Cited in the file of this patent UNTTED STATES PATENTS Number Name Date 1,656,333 Lund Jan. 17, 1928 2,380,204 Turecheck July l0, 1945 2,593,506 Wales Apr. 22, 1952 

